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Lesson Plan

3. Candy Costs: Investigating proportional relationship using graphs

teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
teaches Common Core State Standards CCSS.Math.Content.7.RP.A.2 http://corestandards.org/Math/Content/7/RP/A/2
teaches Common Core State Standards CCSS.Math.Content.7.RP.A.2a http://corestandards.org/Math/Content/7/RP/A/2/a
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This lesson builds on students’ work with coordinate grids and proportional relationships. The task requires students to graph three options for buying candy by the ounce at a candy store then determine whether or not each graph represents a proportional relationship. Students gain an understanding that if two quantities vary proportionally, that relationship between the quantities can be represented as a linear graph which passes through the origin. The mathematical concepts in this task build toward students’ future work with constant of proportionality in graphs. Big Idea: If two quantities vary proportionally, that relationship between the quantities can be represented as a linear graph which passes through the origin. Vocabulary: proportion, proportional relationship, coordinate plane, coordinate, origin Special Materials: graph paper, rulers
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